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Peripheral Problems on Recapped Board

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    #1

    Peripheral Problems on Recapped Board

    Just recapped a Soyo K7V Dragon Plus, replacing all the bulged and leaking Wendells with Ruby MBZ, Ruby ZL, and Sany WG and (less good) Sanyo NHG. All the bigger Wendells and Sacons were removed, though they had no signs of distress.

    CPU is AMD 1600 Athlon XP. Video card is 32MB Nvidia. Video performance is terrible.
    I tried to load Ubuntu as a dual boot with Mandriva. Kept getting stuck at the partitioning process. Tried playing a music CD, plays OK, but I note the CDROM motor gets hot. I tried three different drives, all known good.

    Also this board popped one of the 100uf caps on my Soundblaster card.

    North and South Bridge cips are cool. Whatever is causing this seems connected to the PCI circuits. Seems like it'c slow to detect PCI components.

    PSU is a DELTA with 24 pin to 20 pin adapter. It is newish. Seems to blow warmer air than I would like.

    Checked the BIOS - all voltages fine, but 5 volt is actual 4.67. CPU Temp is 43C.

    Ther's still a few of the crappy Wendells on the board, they all look good though.

    Any hints on where to start?? I rechecked my works and all the solder joints look good.
    There are no burned or damaged traces that I can see. I was very careful about the case - there are no grounded stand-offs
    Tags: None
    #2
    Re: Peripheral Problems on Recapped Board

    ii looked it up a while back, the working rating of power supplies are supposed to be within about 5% of that actual voltage on the plus side and within 10% on the minus side.. so if your +5 volt is 4.67, then it is a little low to be within standards, it should be at least 4.75 to about 5.25, but do not see that to be causing your problems.

    Sensors are not always accurate, so if you can get a tester to check the actual output voltage on the lines, i would try that or a different power supply. IF the supply is good, then you still have a spare, but if it is bad and not reading right, then it just might fix your problems.. I have a board here that the sensor was reading over 15v on the 12v rail by internal sensors, but when checked with an actual tester, found it to be 12.1 which is almost right on, so i can say first hand that those sensors are not always accurate..

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      #3
      Re: Peripheral Problems on Recapped Board

      >Ther's still a few of the crappy Wendells on the board, they all look good though.

      that doesn't mean they are good.
      check with esr meter.

      smaller caps can go bad without showing it.

      Comment

        #4
        Re: Peripheral Problems on Recapped Board

        ATX tolerances for

        +12 is + or - 5% (11.4-12.6)
        +5v is + or - 5% (4.75-5.25)
        +3.3v is + or - 5% (3.135-3.465)
        -12v is + or - 10% (10.8-13.2)
        -5v (if used) is + or - 10% (4.5-5.5)

        Sometimes motherboards sensors can be pretty good, sometimes they can be ridiculously off. Check with a multimeter. As long as that delta is an actual delta electronics, and not just those knock-off sunpro deltas it should be fine.

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          #5
          Re: Peripheral Problems on Recapped Board

          So I measured the cluster of 4 caps marked SPK5 - speaker - 3.85 ESR each value 10uf 25v.

          I found 2 22uf 25v measuring 1.09
          2 100uf 16V at .6 to .8
          470uf 10v at .06 to .13
          220uf 10v and 16v at .13 and .18

          So I can see the sound being affexted by the SPK5 cluster, although it sounded OK.

          Is the other stuff enough to cause the noload/hot problem?

          Comment

            #6
            Re: Peripheral Problems on Recapped Board

            Open up the PSU and check its caps.
            "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

            -Leonid Brezhnev (On the Yom Kippur War)

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              #7
              Re: Peripheral Problems on Recapped Board

              run memtest 86+
              capacitor lab yachtmati techmati

              Comment

                #8
                Re: Peripheral Problems on Recapped Board

                Memtest showed no problems. I can see how the SPK5 cluster could affect video. On playing the movie trailer again, the sound is interrupted as well as the video - could be that the 3.85 ESR is effecting the video as obviously there is both sound and video occurring simultaneously.



                Tomorrow I am going to swap out the power supply for a new one and see if it makes any difference.

                Thanks for the help, much appreciated!

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